Nevada Isostatic Residual Gravity Over Basement

This study of gravity data from Nevada is part of a statewide analysis of mineral
resources. The main objective of the gravity study were: 1) to infer the structure
and composition of the basement; 2) to determine the thickness of Cenozoic deposits.
An iterative procedure based on the gravity data, a knowledge of the surface geology,
and an estimate of the density of Cenozoic deposits was used to separate the isostatic
residual gravity field into two component parts, a "basement" component and a "cover
thickness" component. The former component contains information about the basement
whereas the latter yields an estimate of the thickness of Cenozoic deposits. All computations
were performed with a rectangular grid having intersections spaced at 2 km. The results
are presented as contours on two maps at a scale of 1:1,000,000. Sheet 1 represents
the basement gravity and sheet 2 represents the inferred thickness of Cenozoic cover.
For complete details see Open File Report 90-404.

In addition to giving the Bounding Coordinates in latitude and longitude, the limits
of coverage for the gridded and projected data sets are also given in units of measure
of the projection. This is usually the distance from a central meridian (the x-coordinate),
or base latitude (the y-coordinate), in meters or kilometers of the given projection.
For this data set those boundaries are:The Western-most boundary: -262.898 kilometersThe
Eastern-most boundary: 273.102 kilometersThe Northern-most boundary: 4963.07 kilometersThe
Southern-most boundary: 4177.07 kilometers

Purpose:

To provide easy access to global and regional gravity data and related models for
scientific studies.

Use Limitations

While every effort has been made to ensure that these data are accurate and reliable
within the limits of the current state of the art, NOAA cannot assume liability for
any damages caused by any errors or omissions in the data, nor as a result of the
failure of the data to function on a particular system. NOAA makes no warranty, expressed
or implied, nor does the fact of distribution constitute such a warranty.